package com.zhao.reggie3.filter;

import com.alibaba.fastjson.JSON;
import com.zhao.reggie3.common.BaseContext;
import com.zhao.reggie3.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @description: 过滤器
 * @author: zhaoziliang
 * @time: 2022/8/15
 */
@WebFilter("/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest httpServletRequest =(HttpServletRequest) servletRequest;
        HttpServletResponse httpServletResponse =(HttpServletResponse) servletResponse;
        //1、获取本次请求的URI
        String requestURI = httpServletRequest.getRequestURI();
        log.info("拦截到请求：{}",requestURI);
        //定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };
        //2、判断本次请求是否需要处理
        boolean check = check(urls, requestURI);
        //3、如果不需要处理，则直接放行
        if (check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(servletRequest,servletResponse);
            return;
        }
        //4、判断管理端登录状态，如果已登录，则直接放行
        if (httpServletRequest.getSession().getAttribute("employee")!=null){
            log.info("用户已登录，用户id为：{}",httpServletRequest.getSession().getAttribute("employee"));
            Long empId = (Long) httpServletRequest.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(servletRequest,servletResponse);
            return;
        }
        //4、判断移动端登录状态，如果已登录，则直接放行
        if (httpServletRequest.getSession().getAttribute("user")!=null){
            log.info("用户已登录，用户id为：{}",httpServletRequest.getSession().getAttribute("user"));
            Long userId = (Long) httpServletRequest.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(servletRequest,servletResponse);
            return;
        }
        //5、如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        httpServletResponse.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));

    }
    /** 
     * @Description:      路径匹配，检查本次请求是否需要放行
     * @return: boolean
     */
    public boolean check(String[] urls,String requestURi){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURi);
            if (match){
                return true;
            }
        }
        return false;
    }
}
